Denver-based consulting firm Behre Dolbear & Co. will help Twin Gold (TWG-T) advance the Atlanta gold mine to the production stage.
The mine, a former producer situated near Boise, in southwestern Idaho, awaits a final feasibility study and an environmental impact statement.
Behre Dolbear has also agreed to help Twin Gold secure further financing for the project, if required.
Reserves and resources at the mine are estimated to exceed 1 million oz.
gold and 3.2 million oz. silver.
Free gold comprises 25% to 35% of the total reserves. The reserves near the surface are oxidized, whereas the deeper sulphide reserves are moderately refractory.
Metallurgical testwork has shown that overall recoveries of about 85% can be expected using gravity methods, flotation and bio-oxidation. BacTech Metallurgical Solutions and BioHeap Technologies have expressed interest in providing operating expertise and possible financing to develop the refractory portion of the deposit.
In late 1997, with a view to advancing the Atlanta project, Twin Gold signed confidentiality agreements with two companies specializing in bio-oxidation technology.
Twin Gold, which is headed by mining engineer Hermann Derbuch, has an 80% interest in the Atlanta mine. Quest International Resources (GIX-T) has earned a 20% participating interest by spending US$3.8 million exploring Atlanta since November 1993.
Past production at the Atlanta mine exceeded 400,000 oz. gold and 900,000 oz. silver.
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